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Extremes of Intelligence: Mental Retardation Diagnosis based on IQ and adaptive testing diagnosis reserved for individuals with – sub-average general mental ability – IQ 2 or more SD below mean – accompanied by deficiencies in adaptive skills, – originating before age 18.

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Extremes of Intelligence: Mental Retardation 4 levels: mild, moderate, severe, profound – The vast majority of people with mental retardation have mild mental retardation and are not easily distinguished from the rest of the population.

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Extremes of Intelligence: Mental Retardation Causes: Environmental vs. biological – may include organic syndromes, 350 biological conditions can cause mental retardation – Diagnosticians are only able to pin down an organic cause in <25% of cases. – Environmental theories hold that unfavorable environmental factors may contribute to the development of mild mental retardation [neglect, inadequate nutrition and medical care, lower quality schooling.]

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Figure 9.10 The prevalence and severity of mental retardation

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Figure 9.11 Social class and mental retardation

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Extremes of Intelligence: Giftedness Identification issues – ideals vs. practice – discrepancies regarding how gifted children are identified in the U.S. – Usually, identification occurs based on IQ of 130 or higher, although creativity, leadership, and special talents are recommended for use in identification as well. – IQ 2 SD above mean standard

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Extremes of Intelligence: Giftedness Lewis Terman initiated a study in the early 1920’s with 1500 children with IQs of 150 or higher. These children were followed throughout their lives. As a group, these subjects exhibited better than average physical health, emotional stability, and social satisfaction through their adult years.

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Extremes of Intelligence: Giftedness Ellen Winner (1997) claims that a distinction needs to be made between moderately gifted (IQ ) and profoundly gifted (IQ above 180) individuals, asserting that profoundly gifted children are often introverted and isolated.

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Extremes of Intelligence: Giftedness Studies of giftedness and achievement in life suggest that more than IQ determines high achievement. Joseph Renzulli theorizes that there is a more rare form of giftedness, based in an intersection of 3 factors, that leads to genuine greatness…high intelligence, high creativity, and high motivation.

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Extremes of Intelligence: Giftedness Drudge theory “A genius! For 37 years I’ve practiced fourteen hours a day, and now they call me a genius!” the reaction of one talented violinist

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Extremes of Intelligence: Giftedness Simonton proposes an elaborate theory of talent development that gives roles to both innate ability and environmental factors. obsessive hard work inborn ability allowed one to work harder because efforts are more rewarding.

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Intelligence: Heredity or Environment? This issue has far-reaching sociopolitical implications and continues to be a complex controversy.

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Intelligence: Heredity or Environment? Heredity Family studies determine only whether genetic influence on a trait is plausible, not whether it is certain. Family members also share environments.

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Intelligence: Heredity or Environment? Heredity Twin studies provide evidence regarding the role of genetic factors. The basic rationale is that identical and fraternal twins develop under similar environmental conditions, but identical twins share more genes…if identical twins end up more similar on a given characteristic, it must be genetic.

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Intelligence: Heredity or Environment? Heredity A heritability ratio is an estimate of the proportion of trait variability in a population that is determined by variations in genetic inheritance. A heritability estimate is a group statistic and cannot be meaningfully applied to individuals.

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Intelligence: Heredity or Environment? Environment – Adoption studies – Cumulative deprivation hypothesis – The Flynn effect Adoption studies provide evidence that upbringing plays an important role in mental ability, as adopted children show some resemblance to their foster parents. Also, siblings reared together are more similar in IQ than siblings reared apart. In fact, entirely unrelated children who are reared together show resemblance in IQ.

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Intelligence: Heredity or Environment? The cumulative deprivation hypothesis holds that children raised in deprived environments will experience a gradual decline in IQ as they grow older. Conversely, children removed from deprived environments and placed in homes that are more conducive for learning show IQ increases.

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Intelligence: Heredity or Environment? Environment – Adoption studies – Cumulative deprivation hypothesis – The Flynn effect The Flynn effect is the trend, all over the developed world, for IQ scores to increase from one generation to the next. Hypotheses for why this occurs focus on environmental variables, as evolution does not operate in a generation.

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Clearly, heredity and environment both influence intelligence. Theorists use the term “reaction range” to refer to genetically determined limits on IQ. The environment determines whether a person will fall at the upper or lower end of their genetically determined range.

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The correlations between the IQ scores of identical twins reared apart are lower than those of identical twins reared together. This difference is best explained by the role played by A.Heredity B.Environment C.Neither heredity nor environment D.both Heredity and Environment, equally

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The correlations between the IQ scores of identical twins reared apart are lower than those of identical twins reared together. This difference is best explained by the role played by A.Heredity B.Environment C.Neither heredity nor environment D.both Heredity and Environment, equally

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Figure 9.13 Studies of IQ similarity

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Figure 9.14 The concept of heritability

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Figure 9.16 Reaction range

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Cultural Differences in IQ Heritability as an Explanation – Aurthur Jensen (1969) Arthur Jensen argued that cultural differences in average IQ are largely due to heredity.

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Cultural Differences in IQ Heritability as an Explanation – Herrnstein and Murray (1994) – The Bell Curve – The authors of The Bell Curve, implied that we are moving toward a meritocracy based on intellect – ignited the same controversy.

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Cultural Differences in IQ These arguments have been challenged on a number of grounds. First, even if IQ is largely due to heredity, group differences may not be. Social class and socioeconomic disadvantage are correlated with ethnicity, so environmental variables are not equal between groups.

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New Directions in the Study of Intelligence Biological Indexes and Correlates of Intelligence – Reaction time and inspection time – Brain size

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New Directions in the Study of Intelligence Researchers such as Aurthur Jensen are searching for physiological indicators of general intelligence. – Reaction time has been used in these studies, although the “fast is smart” idea is modest at best. – inspection time, which is an assessment of how long it takes to make simple perceptual discriminations that meet a certain criterion of accuracy. Higher correlations with IQ have been found with this measure, although much work remains to be done to discover why.

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New Directions in the Study of Intelligence Cognitive Conceptualizations of Intelligence focuses on how people use their intelligence. Robert Sternberg’s triarchic theory of intelligence consists of three subtheories: – contextual – experiential – componential In more recent years (1999, 2000), Sternberg has asserted that there are three aspects of what he calls “successful intelligence” – analytical intelligence, creative intelligence, and practical intelligence.

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New Directions in the Study of Intelligence Expanding the Concept of Intelligence – Howard Gardner argues that IQ tests emphasize verbal and mathematical skills and exclude other important skills. He suggests the existence of a number of multiple intelligences – Daniel Goleman and others argue for the concept of emotional intelligence, which is the ability to perceive and express emotion, assimilate emotion in thought, understand and reason with emotion, and regulate emotion.